The headbands do look Semitic because I see a lot of that look in Assyrian reliefs and Steles when it comes to their dealings with local tribes however the medallion is nothing, did Greeks not wear them? ancient peoples used to wear lots of trinkets, that does not point to one group.If you look at some of the reliefs in the Amarna period we can find depictions of Syrians or Asiatics wearing a large medallion strung around the neck, and a tunics with a tassel or group of tassels at four? points around the hem.
Some of the Sea Peoples are also depicted with this same medallion, and tunic hemmed with tassels at four? points around the hem.
2nd figure from left is wearing the medallion.
Center figure, wearing the medallion, tassles on the hem of tunic.
I'm aware these figures do not offer a complete answer to your question, but I hope you can see indications that some of these Sea Peoples were Asiatics, quite possibly Syrian.
What about these images, I can tell you now I've never seen Middle Eastern peoples depicted like this ..................
The above indeed informed our take of the look of the Sea Peoples and if that were so and depctions such as the below are accurate then in all my studies of the Ancient Middle East I've not seen anything like this from those lands, No Semitic peoples, Assyrians, Phoencian's, Mede's, Babylonians, Israelites, Nabateans ......... nothing, this is more a mediterranean Greco look to me.
If these are indeed accurate (obviously we have to take into account modern artistic license) then that is not Semitic peoples.